EP3120622A1 - Réduction de surdébit hs-dpcch dans des scénarios multi-rab - Google Patents

Réduction de surdébit hs-dpcch dans des scénarios multi-rab

Info

Publication number
EP3120622A1
EP3120622A1 EP15717286.7A EP15717286A EP3120622A1 EP 3120622 A1 EP3120622 A1 EP 3120622A1 EP 15717286 A EP15717286 A EP 15717286A EP 3120622 A1 EP3120622 A1 EP 3120622A1
Authority
EP
European Patent Office
Prior art keywords
dpcch
power
transmit power
scaling
indication
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15717286.7A
Other languages
German (de)
English (en)
Other versions
EP3120622B1 (fr
Inventor
Arjun Bharadwaj
Sharad Deepak Sambhwani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Publication of EP3120622A1 publication Critical patent/EP3120622A1/fr
Application granted granted Critical
Publication of EP3120622B1 publication Critical patent/EP3120622B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/223—TPC being performed according to specific parameters taking into account previous information or commands predicting future states of the transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/246—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter calculated in said terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting

Definitions

  • Wireless communication networks are widely deployed to provide various communication services such as telephony, video, data, messaging, broadcasts, and so on.
  • Such networks which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
  • UTRAN UMTS Terrestrial Radio Access Network
  • the UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS), a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3 GPP).
  • UMTS Universal Mobile Telecommunications System
  • 3 GPP 3rd Generation Partnership Project
  • the UMTS which is the successor to Global System for Mobile Communications (GSM) technologies, currently supports various air interface standards, such as Wideband-Code Division Multiple Access (W-CDMA), Time Division-Code Division Multiple Access (TD-CDMA), and Time Division- Synchronous Code Division Multiple Access (TD-SCDMA).
  • W-CDMA Wideband-Code Division Multiple Access
  • TD-CDMA Time Division-Code Division Multiple Access
  • TD-SCDMA Time Division- Synchronous Code Division Multiple Access
  • the UMTS also supports enhanced 3G data communications protocols, such as High Speed Packet Access (HSPA), which provides higher data transfer speeds and capacity to associated UMTS networks.
  • HSPA High Speed Packet Access
  • DPCCH dedicated physical control channel
  • DPDCH dedicated physical data channel
  • the disclosure provides for reducing uplink control channel overhead at a user equipment (UE).
  • the UE may determine that a total transmit power of the UE exceeds an allocated power.
  • the UE may then scale a transmit power of a high-speed dedicated physical control channel (HS-DPCCH) relative to a dedicated physical control channel (DPCCH) in response to the determination that the UE is power limited.
  • the UE may scale the transmit power of the HS-DPCCH when there is no downlink activity as determined, for example, by expiration of a timer.
  • the UE may transmit an indication that the UE is power limited, for example, by using a most-significant bit of a transport format combination index.
  • the UE may receive an indication that a downlink transmission is imminent and, in response, the UE may transmit the HS-DPCCH without scaling its corresponding transmit power.
  • the disclosure provides a method of reducing uplink control channel overhead at a UE.
  • the method may include determining that a total transmit power of the UE exceeds an allocated power.
  • the method may further include scaling a transmit power of a high-speed dedicated physical control channel (HS-DPCCH) relative to a dedicated physical control channel (DPCCH) in response to the determination that the total transmit power of the UE exceeds the allocated power.
  • HS-DPCCH high-speed dedicated physical control channel
  • DPCCH dedicated physical control channel
  • the disclosure provides an apparatus for reducing uplink control channel overhead at a UE.
  • the apparatus may include means for determining that a total transmit power of the UE exceeds an allocated power.
  • the apparatus may further include means for scaling a transmit power of a HS-DPCCH relative to a DPCCH in response to the determination that the total transmit power of the UE exceeds the allocated power.
  • the disclosure provides another apparatus for reducing uplink control channel overhead at a UE.
  • the apparatus may include a power control component configured to determine that a total transmit power of the UE exceeds an allocated power.
  • the apparatus may further include a channel scaling component configured to scale a transmit power of a HS-DPCCH relative to a DPCCH in response to the determination that the total transmit power of the UE exceeds the allocated power.
  • Another aspect of the disclosure provides a computer-readable medium storing computer executable code for reducing uplink control channel overhead at a UE.
  • the computer-readable medium may include code for determining that a total transmit power of the UE exceeds an allocated power and code for scaling a transmit power of a HS-DPCCH relative to a DPCCH in response to the determination that the total transmit power of the UE exceeds the allocated power.
  • FIG. 1 is a diagram conceptually illustrating a user equipment in communication with a network.
  • FIG. 2 is a flow diagram conceptually illustrating a method of controlling uplink transmit power.
  • FIG. 3 is a diagram conceptually illustrating power scaling.
  • FIG. 4 is a diagram conceptually illustrating communications between a user equipment and a network.
  • FIG. 5 is a diagram conceptually illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • FIG. 6 is a block diagram conceptually illustrating an example of a telecommunications system.
  • FIG. 7 is a conceptual diagram illustrating an example of an access network.
  • FIG. 8 is a conceptual diagram illustrating a radio protocol architecture.
  • FIG. 9 is a block diagram conceptually illustrating an example of a Node B in communication with a UE in a telecommunications system.
  • a user equipment may have more than one wireless connection to a network.
  • the UE may have a first radio access bearer for a circuit switched voice call and may have a second radio access bearer for packet switched data services.
  • a UE operating in a multi- RAB scenario may face power limitations.
  • the UE may be assigned a maximum transmit power that is insufficient to transmit all desired channels at desired levels. That is, the transmit power allocated to the UE is not sufficient to meet the total transmit power requirements of the UE.
  • vital channels e.g., control and/or data channels
  • a UE may reduce uplink transmission power when power limited in a multi-RAB scenario by reducing the transmission power of a high speed dedicated physical control channel (HS-DPCCH).
  • the transmission power for the HS-DPCCH may be scaled or adjusted independently of other uplink channels including the dedicated physical control channel (DPCCH).
  • the transmit power of the HS-DPCCH may be scaled independently when there is no received data on a downlink high speed dedicated shared channel (HS-DSCH).
  • HS- DPCCH may be scaled independently only when there is no received data on the downlink HS-DSCH.
  • a portion of the HS-DPCCH may be scaled independently, for example, the portion carrying channel quality indicator (CQI)
  • the UE may signal the power-limited condition so that the serving cell may stop downlink transmissions.
  • the UE may use the transport format combination indicator (TFCI) to signal to the serving cell a power- limited condition of the UE.
  • the serving cell may provide an indication that downlink data transmission is imminent, and the UE may provide unsealed HS-DPCCH to provide correct channel information (e.g., CQI) for the downlink transmission.
  • a wireless communication system 10 includes at least one UE 12 in communication coverage of at least one network entity 14 (e.g., base station).
  • UE 12 may communicate with network 16 via network entity 14.
  • multiple UEs including UE 12 may be in communication coverage with one or more network entities, including network entity 14.
  • UE 12 may transmit and/or receive wireless communications to and/or from network entity 14.
  • the UE may transmit uplink signals 40 and receive downlink signals 50.
  • UE 12 may be power controlled to prevent interference to another network entity such as network entity 15, for example.
  • UE 12 may be allocated a limited amount of power for uplink signals 40.
  • UE 12 may also be referred to by those skilled in the art (as well as interchangeably herein) as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology.
  • network entity 14 may be a small cell, macrocell, picocell, femtocell, relay, Node B, mobile Node B, UE (e.g., communicating in peer-to-peer or ad-hoc mode with UE 12), or substantially any type of component that can communicate with UE 12 to provide wireless network access at the UE 12.
  • small cell refers to a relatively low transmit power and/or a relatively small coverage area cell as compared to a transmit power and/or a coverage area of a macro cell.
  • the term “small cell” may include, but is not limited to, cells such as a femto cell, a pico cell, access point base stations, Home NodeBs, femto access points, or femto cells.
  • a macro cell may cover a relatively large geographic area, such as, but not limited to, several kilometers in radius.
  • a pico cell may cover a relatively small geographic area, such as, but not limited to, a building.
  • a femto cell also may cover a relatively small geographic area, such as, but not limited to, a home, or a floor of a building.
  • UE 12 may include modem component 20, which may be configured to control uplink power.
  • the modem component 20 may be configured to control the transmission power used in one or more uplink channels.
  • the modem component 20 may include a downlink activity timer 22, a power control component 24 and a feedback controller 30.
  • the term "component" as used herein may be one of the parts that make up a system, may be hardware or software, and may be divided into other components.
  • the downlink activity timer 22 may include hardware or means for determining or detecting whether the UE 12 has downlink activity.
  • the downlink activity timer 22 may be configured to measure a configurable period of time since a previous downlink transmission, for example, a data transmission on a high speed dedicated shared channel (HS-DSCH) 52, which may be part of the downlink signal 50.
  • the downlink activity timer 22 may be or may include a memory storing the time of the last downlink transmission or a number of units of time since the last downlink transmission. The downlink activity timer 22 may expire when no subsequent downlink transmissions have occurred within the configurable period of time since the last downlink transmission.
  • the downlink activity timer 22 may be reset whenever a downlink transmission is received.
  • the downlink activity timer 22 may ignore downlink transmissions on other channels. For example, absolute grants, relative grants, paging messages, feedback, and other signaling may not be considered downlink transmissions for the downlink activity timer 22.
  • the power control component 24 may include hardware or means for controlling the power level (e.g., transmission power) of uplink channels.
  • the power control component 24 may include, or may be executable by, a processor executing firmware or software for controlling the power level of uplink channels.
  • the power control component 24 may be configured to determine that the UE 12 is power limited.
  • the power control component 24 may determine that the UE 12 is power limited based on a maximum allowed transmit power, which in turn may be based on a received grant and power control commands.
  • the UE 12 may receive a grant on the absolute grant channel (AGCH) and receive power control commands on the relative grant channel (RGCH).
  • the UE 12 may also be power limited by the available transmit power of the UE 12.
  • the power control component 24 may be configured to determine that the UE 12 is power limited when a power necessary to transmit all of the uplink channels exceeds the maximum allowed transmit power.
  • being a power-limited UE may refer to, for example, having a transmission power requirement that exceeds the maximum allocated or allowed transmission power of the UE.
  • the condition of being power limited may also be described in terms of a power headroom.
  • the power headroom may be a difference between the maximum allowed transmit power and a current transmit power.
  • the UE 12 may be power limited when the power headroom is zero or a negative value.
  • the power control component 24 may independently control the transmission power of a high speed dedicated physical control channel (HS-DPCCH) 42.
  • the HS-DPCCH 42 may be part of the uplink signals 40 and carry feedback information including an acknowledgment (ACK) and a channel quality indicator (CQI) used by the node B (e.g., network entity 14) for scheduling downlink activity.
  • the power control component 24 may be configured to reduce the transmission power of the HS-DPCCH 42 when the UE is power limited and/or has no downlink activity.
  • the power control component 24 may include a status signaling component 26 and a channel scaling component 28.
  • the status signaling component 26 may include hardware or means for signaling a power status of the UE 12.
  • the status signaling component 26 may be configured to transmit an indication that the UE 12 is power limited.
  • the status signaling component 26 may include, or may be executable by, a processor executing firmware or software for transmitting an indication that the UE 12 is power limited.
  • the status signaling component 26 may also include a transmitter (not shown) for transmission of the signaling or power status indication.
  • the UE 12 may be power limited when the required total transmit power for all uplink channels exceeds the maximum allowed transmit power as determined by the power control component 24.
  • the status signaling component 26 may detect that the UE 12 is power limited and transmit an indication in an uplink channel.
  • the signaling component 26 may indicate the power status of the UE 12 using a transport format combination indicator (TFCI).
  • TFCI generally may indicate the transport format combination used for an uplink data transmission.
  • the TFCI may be transmitted on the DPCCH 44.
  • an enhanced TFCI (E- TFCI) transmitted on the E-DCH 46 and indicating the format of data transmitted on the E-DCH 46 may be used to signal the power status of the UE 12.
  • E- TFCI enhanced TFCI
  • Descriptions herein of the TFCI may be similarly applicable to an E-TFCI.
  • the TFCI may be allocated 10 bits. In an aspect, at least one of the bits of the TFCI may be used to indicate the power status of the UE.
  • the most significant bit may indicate the power status.
  • a value of T may indicate that the UE is power limited while a value of ⁇ ' may indicate normal operation.
  • the remaining bits of the TFCI may be adequate for signaling the different transport format combinations used in a call.
  • the signaling component 26 may indicate the power status of the UE 12 using a specific CQI value.
  • a CQI value of 0 may indicate that the UE is power limited.
  • the network element 14 may reduce or stop downlink transmissions upon receipt of a power status indication that the UE 12 is power limited.
  • the examples described above are illustrative and non-limiting, thus other indicators may also be used to provide information regarding the power status of UE 12.
  • the channel scaling component 28 may include hardware or means for scaling (e.g., adjusting) the transmit power of an uplink channel relative to the DPCCH 44.
  • scaling the transmit power may involve reducing the transmit power of a particular channel to a target power level.
  • the channel scaling component 28 may include, or may be executable by, a processor executing firmware or software for scaling the transmit power used by a transmitter for an uplink channel relative to the DPCCH 44.
  • the channel scaling component 28 may scale the HS-DPCCH 42 relative to the DPCCH 44. For example, the channel scaling component 28 may reduce the ratio of the HS-DPCCH power relative to the DPCCH power.
  • the transmit power of the DPCCH 44 may remain constant (or as determined necessary) while the transmit power of the HS-DPCCH 42 is reduced below a determined level. Power levels for other channels within the uplink signals 40 may remain constant with respect to the DPCCH 44.
  • the channel scaling component 28 may reduce the power of HS-DPCCH such that the total transmission power for all uplink channels does not exceed a maximum allowed transmit power.
  • the channel scaling component 28 may apply a scaling factor to the gain factor, for the HS-DPCCH based on the maximum allowed transmit power.
  • the channel scaling component 28 may scale the transmission power of HS-DPCCH 42 to zero or discontinuous transmission (DTX) before scaling the transmission power of DPCCH 44.
  • DTX discontinuous transmission
  • the channel scaling component 28 may allow the DPCCH 44 and related channels to maintain higher power levels for maintaining a call, for example, a voice call on the DPDCH 48.
  • the channel scaling component 28 may scale the power for only a portion of the HS-DPCCH 42.
  • the channel scaling component 28 may independently scale the transmit power of the HS-DPCCH 42 during the time slots in which the HS-DPCCH 42 is carrying the CQI and refrain from independently scaling the HS-DPCCH 42 when the HS-DPCCH 42 is carrying the ACK.
  • the channel scaling component 28 may scale the power of the HS- DPCCH 42 only when the UE 12 is power limited and the downlink activity timer 22 is expired.
  • the channel scaling component 28 may scale the power of the HS- DPCCH 42 in response to a determination that the total transmit power of the UE exceeds the allocated power.
  • the channel scaling component 28 may also scale the power of the DPCCH 42 in response to a determination that the UE 12 has no downlink activity.
  • the feedback controller 30 may include hardware or means for controlling feedback regarding the downlink such as CQI feedback.
  • the feedback controller 30 may include, or may be executable by a processor executing firmware or software for controlling a CQI cycle.
  • the CQI cycle may be a time period such as a number of time slots or transmission time intervals between transmissions of a CQI.
  • the feedback controller 30 may include a CQI cycle controller 32 and an order processing component 34.
  • the CQI cycle controller 32 may include hardware or means for reducing the CQI cycle based on a determination that there is no downlink traffic.
  • the CQI cycle controller 32 may include, or may be executable by, a processor executing firmware or software for a reducing the CQI cycle.
  • the CQI cycle controller 32 may reduce the CQI cycle responsive to the downlink activity timer 22 expiring.
  • the CQI cycle controller 32 may reduce the CQI to a configured value lower than a normal CQI feedback cycle. For example, instead of reporting a CQI every sub-frame, the UE 12 may report a CQI every Nth sub-frame, where N is an integer greater than one.
  • the CQI cycle controller 32 may also completely stop the UE 12 from reporting CQI. By reducing the CQI cycle, the CQI cycle controller 32 may reduce the amount of data transmitted in the uplink by UE 12.
  • the order processing component 34 may include hardware or means for processing control orders received from a serving cell (e.g., network entity 14 or 15).
  • the order processing component 34 may include or be executable by a processor executing firmware or software for processing high speed-shared control channel (HS-SCCH) orders.
  • HS-SCCH order may be a low level (e.g. PHY layer or LI) command carried on the downlink HS-SCCH that may be used to quickly reconfigure the UE 12.
  • the network entity 14 may provide an HS-SCCH order indicating that a downlink transmission is imminent.
  • An imminent transmission may be a transmission scheduled within a certain time period or number of subframes.
  • the HS-SCCH order may indicate a certain time period or number of subframes until a scheduled HS-DPCH transmission for the UE 12.
  • the HS-SCCH order may also indicate an imminent transmission without providing a specific time period.
  • the order processing component 34 may return the CQI cycle of the UE 12 to the normally configured CQI cycle.
  • the order processing component 34 may also initiate an immediate CQI transmission.
  • the order processing component 34 may trigger transmission of a CQI on the HS-DCCH in the next sub- frame.
  • the CQI may provide information useful for formatting the downlink transmission.
  • the HS-DCCH may be transmitted with unsealed power.
  • the UE 12 may transmit the HS-DCCH with a necessary power level even if the total power level exceeds the maximum allowed transmission power.
  • the HS-DCCH may be transmitted with unsealed power relative to the DPCCH (e.g. using uniform scaling).
  • FIG. 2 is a flow diagram conceptually illustrating a method 200 of power control.
  • the method 200 may be performed by a UE 12 including the modem component 20.
  • the method 200 may include determining that a total transmit power of the UE 12 exceeds an allocated power.
  • the power control component 24 may determine that the total transmit power of the UE 12 exceeds the allocated power.
  • the power control component 24 may determine that the UE 12 is power limited based on a maximum allowed transmit power and a power for transmitting the uplink channels.
  • the method 200 may optionally include transmitting an indication that the total transmit power of the UE 12 exceeds the allocated power.
  • the status signaling component 26 may transmit the indication that the total transmit power of the UE 12 exceeds the allocated power.
  • the TFCI may be used to transmit the indication that the total transmit power of the UE 12 exceeds the allocated power.
  • the most significant bit of the TFCI may indicate whether the a total transmit power of the UE 12 exceeds an allocated power.
  • a CQI value of 0 may indicate that the total transmit power of the UE 12 exceeds the allocated power.
  • the method 200 may optionally include determining that the UE 12 has no downlink activity.
  • the downlink activity timer 22 may be used to determine whether the UE 12 has downlink activity. For example, if the downlink activity timer 22 has expired, the UE 12 may have no downlink activity. If the downlink activity timer 22 has not expired, the UE 12 may have downlink activity.
  • the method 200 may include scaling a transmit power of a HS-DPCCH relative to a DPCCH.
  • the channel scaling component 28 may scale a transmit power of a HS-DPCCH relative to a DPCCH. Scaling the transmit power of the HS-DPCCH may be in response determining that a total transmit power of the UE 12 exceeds an allocated power and/or determining that the UE has no downlink activity in block 30.
  • the channel scaling component 28 may reduce the power for transmitting a channel quality indicator portion of the HS- DPCCH. Further, if there is no downlink activity, the power scaling component 28 may also reduce the power for transmitting an ACK portion of the HS-DPCCH.
  • the transmit power of the HS-DPCCH may be scaled before scaling is applied to other uplink channels.
  • the channel scaling component 28 may first scale the transmit power for the E-DCH, then scale the transmit power for HS- DPCCH, then scale the transmit power for the remaining uplink channels.
  • HS-DPCCH may be scaled before the E-DCH.
  • the method 200 may optionally include reducing a CQI cycle.
  • the CQI cycle controller 32 may reduce the CQI cycle.
  • the CQI cycle may be reduced responsive to determining that the UE has no downlink activity in block 230.
  • the CQI cycle controller 32 may determine a time between CQI transmissions that is greater than a normal time between CQI transmissions. Accordingly, the UE 12 may transmit CQI information less frequently.
  • the method 200 may optionally include receiving an indication that a downlink transmission is imminent.
  • the order processing component 34 may receive an indication that a downlink transmission is imminent.
  • the order processing component 34 may receive an HS-SCCH order indicating that data will be transmitted to the UE on a HS-DSCH.
  • the method 200 may optionally include transmitting the HS-DPCCH with unsealed power relative to the DPCCH.
  • the channel scaling component 28 may transmit the HS-DPCCH with unsealed power relative to the DPCCH. Transmitting the HS-DPCCH with unsealed power relative to the DPCCH may be in response to receiving the indication that a downlink transmission is imminent. For example, the channel scaling component may refrain from independently scaling the power of the HS-DPCCH in response to the indication that a downlink transmission is imminent. The UE 12 may still uniformly scale the HS- DPCCH with respect to the DPCCH if necessary to remain under the maximum allowed transmit power.
  • the order processing component 34 may trigger a transmission of the CQI on the unsealed HS-DPCCH if, for example, the CQI cycle has been reduced. For example, the order processing component 34 may trigger transmission of the CQI in the next available sub-frame.
  • FIG. 3 is a conceptual diagram illustrating power scaling of uplink channels.
  • the scaling of uplink channels may be performed by a channel scaling component 28 (FIG. 1) within a UE 12.
  • the maximum allowed transmit power 310 may be determined by the power control component 24 (FIG. 1) based on an absolute grant and/or relative grants.
  • the maximum allowed transmit power 310 may also be limited by the characteristics of the UE. For example, the UE 12 may be unable to transmit above the maximum allowed transmit power 310 even if the absolute grant provides for a higher transmit power than the one UE 12 is capable of providing.
  • Transmission 320 may illustrate a transmission power for transmitting unsealed uplink channels including DPDCH 326, HS-DPCCH 324, and DPCCH 322.
  • E-DCH channels are not shown.
  • the E-DCH channels may not be configured, or may be scaled to zero transmit power before other uplink channels.
  • the UE 12 may be unable to transmit the unsealed uplink channels of transmission 320 because of the maximum allowed transmit power 310. Accordingly, the UE 12 may be power limited because the transmission power for the unsealed uplink channels exceeds the maximum allowed transmit power 310.
  • Transmission 330 may illustrate transmission power for transmitting uniformly scaled uplink channels including DPDCH 336, HS-DPCCH 334, and DPCCH 332.
  • the transmission power for DPDCH 336 may be reduced compared to the transmission power for DPDCH 326.
  • scaling the DPDCH 336 may result in transmission errors, a reduction in call quality, and/or a dropped call.
  • Transmission 340 may illustrate transmission power for transmitting uplink channels with selective scaling applied to HS-DPCCH 344 and no scaling applied to DPCCH 342 and DPDCH 346.
  • DPCCH 342 may be transmitted with the same transmission power as DPCCH 322.
  • DPDCH 346 may be transmitted with the same transmission power as DPDCH 326, that is, the required transmission power. Accordingly, the DPDCH 346 may be more likely to be received without errors than the DPDCH 336.
  • a voice call carried on the DPDCH 336 may be less likely to have reduced quality or less likely to be dropped.
  • Transmission 350 may illustrate a transmission power when maximum selective scaling of an HS-DPCCH is used.
  • the transmission 350 may have no power allocated to an HS-DPCCH.
  • DPDCH 356 may be transmitted with the unsealed transmit power of DPDCH 326.
  • the total transmit power for the uplink channels may be a transmit power 360, which may be less than the maximum allowed transmit power 310.
  • UE 12 may transmit at a lower power and generate less interference while maintaining call quality using selective scaling of the HS-DPCCH under appropriate conditions.
  • the UE 12 may be configured to use uniform scaling and/or selective scaling operations, and may be configured to select between them according to certain operating conditions or preferences. For example, selective scaling may be used when the UE 12 has no downlink activity. Also, uniform scaling may be applied after selective scaling when the selective scaling does not sufficiently reduce the total transmission power.
  • FIG. 4 illustrates a diagram showing messages transmitted in a network between a UE 12 and a network entity 14.
  • the message 410 may be a grant transmitted by the network entity 14 and received by the UE 12.
  • the grant may indicate or be used to determine a maximum allowed (allocated) transmit power.
  • the UE 12 may determine that the UE 12 is power limited.
  • Message 430 from UE 12 to network entity 14 may include a TFCI or CQI indicating that the UE 12 is power limited.
  • the network entity 14 may pause or otherwise limit downlink transmissions to UE 12 in response to receiving the message 430 indicating that the UE 12 is power limited.
  • the downlink timer 22 at the UE 12 may expire because the network entity 14 has not been transmitting downlink data.
  • the message 460 from UE 12 to network entity 14 may be an uplink transmission including the independently scaled HS-DPCCH.
  • the message 460 may also include other uplink channels such as the DPDCH and DPCCH, which are not scaled.
  • the message 460 may also include a TFCI indicating the format of, for example, the DPDCH as well as an indicator of the current power status of the UE 12. For example, the UE 12 may remain in a power limited state or may no longer be power limited if the grant has changed.
  • the network entity 14 may determine that a downlink is imminent.
  • the network entity 14 may have high priority data to transmit.
  • the message 480 from network entity 14 to UE 12 may be an HS-SCCH order indicating that a downlink transmission is imminent.
  • the message 490 from UE 12 to network entity 14 may be an unsealed HS-DPCCH including a CQI.
  • the message 495 from network entity 14 to UE 12 may include downlink data carried in the HS-DSCH in a transport block size selected based on the CQI.
  • FIG. 5 is a block diagram illustrating an example of a hardware implementation for an apparatus 500 employing a processing system 514 including a modem component 20.
  • the processing system 514 may be implemented with a bus architecture, represented generally by the bus 502.
  • the bus 502 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 514 and the overall design constraints.
  • the bus 502 links together various circuits including one or more processors, represented generally by the processor 504, and computer-readable media, represented generally by the computer-readable medium 506.
  • the bus 502 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • a bus interface 508 provides an interface between the bus 502 and a transceiver 510.
  • the transceiver 510 provides a means for communicating with various other apparatus over a transmission medium.
  • a user interface 512 e.g., keypad, display, speaker, microphone, joystick
  • the processor 504 is responsible for managing the bus 502 and general processing, including the execution of software stored on the computer-readable medium 506.
  • the software when executed by the processor 504, causes the processing system 514 to perform the various functions described infra for any particular apparatus.
  • the computer-readable medium 506 may also be used for storing data that is manipulated by the processor 504 when executing software.
  • the modem component 20 may include hardware configured for controlling transmission (e.g., power level transmissions) of the processing system 514.
  • the modem component 20 may be a separate component, or may be integrated with the processor 504 or the computer-readable medium 506.
  • the modem component 20 may control transceiver 510 for transmitting uplink channels and receiving downlink channels.
  • the modem component 20 may update status information, which may be stored in the computer-readable medium 506 and used by the processor 504.
  • modem component 20 may be implemented by any one or more of processor 504 and computer-readable medium 506.
  • the processor and/or computer-readable medium 506 may be configured to, via modem component 20, control the power of a user equipment (e.g., UE 12).
  • the modem component 20 may be implemented as hardware, software, firmware, etc.
  • a UMTS network includes three interacting domains: a Core Network (CN) 604, a UMTS Terrestrial Radio Access Network (UTRAN) 602, and User Equipment (UE) 610.
  • the UE 610 may correspond to the UE 12 and include a modem component 20 for performing security mode procedures.
  • the UTRAN 602 provides various wireless services including telephony, video, data, messaging, broadcasts, and/or other services.
  • the UTRAN 602 may include a plurality of Radio Network Subsystems (RNSs) such as an RNS 607, each controlled by a respective Radio Network Controller (RNC) such as an RNC 606.
  • RNSs Radio Network Subsystems
  • RNC Radio Network Controller
  • the UTRAN 602 may include any number of RNCs 606 and RNSs
  • the RNC 606 is an apparatus responsible for, among other things, assigning, reconfiguring and releasing radio resources within the RNS 607.
  • the RNC 606 may be interconnected to other RNCs (not shown) in the UTRAN 602 through various types of interfaces such as a direct physical connection, a virtual network, or the like, using any suitable transport network.
  • Communication between a UE 610 and a Node B 608 may be considered as including a physical (PHY) layer and a medium access control (MAC) layer. Further, communication between a UE 610 and an RNC 606 by way of a respective Node B
  • the 608 may be considered as including a radio resource control (RRC) layer.
  • RRC radio resource control
  • the PHY layer may be considered layer 1 ; the MAC layer may be considered layer 2; and the RRC layer may be considered layer 3.
  • Information herein utilizes terminology introduced in the RRC Protocol Specification.
  • the geographic region covered by the RNS 607 may be divided into a number of cells, with a radio transceiver apparatus serving each cell.
  • a radio transceiver apparatus is commonly referred to as a Node B in UMTS applications, but may also be referred to by those skilled in the art as a base station (BS), a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), or some other suitable terminology.
  • BS basic service set
  • ESS extended service set
  • AP access point
  • three Node Bs 608 are shown in each RNS 607; however, the RNSs 607 may include any number of wireless Node Bs.
  • the Node Bs 608 provide wireless access points to a CN 604 for any number of mobile apparatuses.
  • a mobile apparatus include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a notebook, a netbook, a smartbook, a personal digital assistant (PDA), a satellite radio, a global positioning system (GPS) device, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • GPS global positioning system
  • multimedia device e.g., a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device.
  • MP3 player digital audio player
  • the mobile apparatus is commonly referred to as a UE in UMTS applications, but may also be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology.
  • the UE 610 may further include a universal subscriber identity module (USIM) 61 1 , which contains a user's subscription information to a network.
  • USIM universal subscriber identity module
  • the downlink also called the forward link, refers to the communication link from a Node B 608 to a UE 610
  • the UL also called the reverse link, refers to the communication link from a UE 610 to a Node B 608.
  • the CN 604 interfaces with one or more access networks, such as the UTRAN 602.
  • the CN 604 is a GSM core network.
  • the various concepts presented throughout this disclosure may be implemented in a RAN, or other suitable access network, to provide UEs with access to types of CNs other than GSM networks.
  • the CN 604 includes a circuit-switched (CS) domain and a packet-switched (PS) domain.
  • Some of the circuit-switched elements are a Mobile Services Switching Centre (MSC), a Visitor location register (VLR) and a Gateway MSC (GMSC).
  • Packet-switched elements include a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN).
  • Some network elements, like EIR, HLR, VLR and AuC may be shared by both of the circuit-switched and packet-switched domains.
  • the CN 604 supports circuit-switched services with a MSC 612 and a GMSC 614.
  • the GMSC 614 may be referred to as a media gateway (MGW).
  • MGW media gateway
  • One or more RNCs, such as the RNC 606, may be connected to the MSC 612.
  • the MSC 612 is an apparatus that controls call setup, call routing, and UE mobility functions.
  • the MSC 612 also includes a VLR that contains subscriber-related information for the duration that a UE is in the coverage area of the MSC 612.
  • the GMSC 614 provides a gateway through the MSC 612 for the UE to access a circuit-switched network 616.
  • the GMSC 614 includes a home location register (HLR) 615 containing subscriber data, such as the data reflecting the details of the services to which a particular user has subscribed.
  • HLR home location register
  • the HLR is also associated with an authentication center (AuC) that contains subscriber-specific authentication data.
  • AuC authentication center
  • the GMSC 614 queries the HLR 615 to determine the UE's location and forwards the call to the particular MSC serving that location.
  • the CN 604 also supports packet-data services with a serving GPRS support node (SGSN) 618 and a gateway GPRS support node (GGSN) 620.
  • GPRS which stands for General Packet Radio Service, is designed to provide packet-data services at speeds higher than those available with standard circuit-switched data services.
  • the GGSN 620 provides a connection for the UTRAN 602 to a packet-based network 622.
  • the packet-based network 622 may be the Internet, a private data network, or some other suitable packet-based network.
  • the primary function of the GGSN 620 is to provide the UEs 610 with packet-based network connectivity. Data packets may be transferred between the GGSN 620 and the UEs 610 through the SGSN 618, which performs primarily the same functions in the packet-based domain as the MSC 612 performs in the circuit-switched domain.
  • An air interface for UMTS may utilize a spread spectrum Direct-Sequence Code Division Multiple Access (DS-CDMA) system.
  • the spread spectrum DS-CDMA spreads user data through multiplication by a sequence of pseudorandom bits called chips.
  • the "wideband" W-CDMA air interface for UMTS is based on such direct sequence spread spectrum technology and additionally calls for a frequency division duplexing (FDD).
  • FDD uses a different carrier frequency for the UL and DL between a Node B 608 and a UE 610.
  • Another air interface for UMTS that utilizes DS- CDMA, and uses time division duplexing (TDD), is the TD-SCDMA air interface.
  • TD-SCDMA time division duplexing
  • An HSPA air interface includes a series of enhancements to the 3G/W-CDMA air interface, facilitating greater throughput and reduced latency.
  • HSPA utilizes hybrid automatic repeat request (HARQ), shared channel transmission, and adaptive modulation and coding.
  • HARQ hybrid automatic repeat request
  • the standards that define HSPA include HSDPA (high speed downlink packet access) and HSUPA (high speed uplink packet access, also referred to as enhanced uplink, or EUL).
  • HSDPA utilizes as its transport channel the high-speed downlink shared channel (HS- DSCH).
  • the HS-DSCH is implemented by three physical channels: the high-speed physical downlink shared channel (HS-PDSCH), the high-speed shared control channel (HS-SCCH), and the high-speed dedicated physical control channel (HS- DPCCH).
  • the HS-DPCCH carries the HARQ ACK/NACK signaling on the uplink to indicate whether a corresponding packet transmission was decoded successfully. That is, with respect to the downlink, the UE 610 provides feedback to the node B 608 over the HS-DPCCH to indicate whether it correctly decoded a packet on the downlink.
  • HS-DPCCH further includes feedback signaling from the UE 610 to assist the node B 608 in taking the right decision in terms of modulation and coding scheme and precoding weight selection, this feedback signaling including the channel quality indicator (CQI) and precoding matrix indicator (PMI).
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • HSPA Evolved or HSPA+ is an evolution of the HSPA standard that includes MIMO and 64-QAM, enabling increased throughput and higher performance. That is, in an aspect of the disclosure, the node B 608 and/or the UE 610 may have multiple antennas supporting MIMO technology. The use of MIMO technology enables the node B 608 to exploit the spatial domain to support spatial multiplexing, beamforming, and transmit diversity.
  • MIMO Multiple Input Multiple Output
  • MIMO systems generally enhance data transmission performance, enabling diversity gains to reduce multipath fading and increase transmission quality, and spatial multiplexing gains to increase data throughput.
  • Spatial multiplexing may be used to transmit different streams of data simultaneously on the same frequency.
  • the data steams may be transmitted to a single UE 610 to increase the data rate or to multiple UEs 610 to increase the overall system capacity. This is achieved by spatially precoding each data stream and then transmitting each spatially precoded stream through a different transmit antenna on the downlink.
  • the spatially precoded data streams arrive at the UE(s) 610 with different spatial signatures, which enables each of the UE(s) 610 to recover the one or more the data streams destined for that UE 610.
  • each UE 610 may transmit one or more spatially precoded data streams, which enables the node B 608 to identify the source of each spatially precoded data stream.
  • Spatial multiplexing may be used when channel conditions are good.
  • beamforming may be used to focus the transmission energy in one or more directions, or to improve transmission based on characteristics of the channel. This may be achieved by spatially precoding a data stream for transmission through multiple antennas. To achieve good coverage at the edges of the cell, a single stream beamforming transmission may be used in combination with transmit diversity.
  • n transport blocks may be transmitted simultaneously over the same carrier utilizing the same channelization code. Note that the different transport blocks sent over the n transmit antennas may have the same or different modulation and coding schemes from one another.
  • Single Input Multiple Output generally refers to a system utilizing a single transmit antenna (a single input to the channel) and multiple receive antennas (multiple outputs from the channel).
  • a single transport block is sent over the respective carrier.
  • FIG. 7 an access network 700 in a UTRAN architecture is illustrated.
  • the multiple access wireless communication system includes multiple cellular regions (cells), including cells 702, 704, and 706, each of which may include one or more sectors.
  • the UEs 730, 732, 734, 736, 738, 740 may each correspond to the UE 12 (FIG. 1) and include a modem component 20.
  • the multiple sectors can be formed by groups of antennas with each antenna responsible for communication with UEs in a portion of the cell. For example, in cell 702, antenna groups 712, 714, and 716 may each correspond to a different sector. In cell 704, antenna groups 718, 720, and 722 each correspond to a different sector. In cell 706, antenna groups 724, 726, and 728 each correspond to a different sector.
  • the cells 702, 704 and 706 may include several wireless communication devices, e.g., User Equipment or UEs, which may be in communication with one or more sectors of each cell 702, 704 or 706.
  • UEs 730 and 732 may be in communication with Node B 742
  • UEs 734 and 736 may be in communication with Node B 744
  • UEs 738 and 740 can be in communication with Node B 746.
  • each Node B 742, 744, 746 is configured to provide an access point to a CN 604 (see FIG. 6) for all the UEs 730, 732, 734, 736, 738, 740 in the respective cells 702, 704, and 706.
  • a serving cell change (SCC) or handover may occur in which communication with the UE 734 transitions from the cell 704, which may be referred to as the source cell, to cell 706, which may be referred to as the target cell.
  • Management of the handover procedure may take place at the UE 734, at the Node Bs corresponding to the respective cells, at a radio network controller 606 (see FIG. 6), or at another suitable node in the wireless network.
  • the UE 734 may monitor various parameters of the source cell 704 as well as various parameters of neighboring cells such as cells 706 and 702.
  • the UE 734 may maintain communication with one or more of the neighboring cells. During this time, the UE 734 may maintain an Active Set, that is, a list of cells that the UE 734 is simultaneously connected to (i.e., the UTRA cells that are currently assigning a downlink dedicated physical channel (DPCH) or fractional downlink dedicated physical channel (F-DPCH) to the UE 734 may constitute the Active Set).
  • an Active Set that is, a list of cells that the UE 734 is simultaneously connected to (i.e., the UTRA cells that are currently assigning a downlink dedicated physical channel (DPCH) or fractional downlink dedicated physical channel (F-DPCH) to the UE 734 may constitute the Active Set).
  • DPCH downlink dedicated physical channel
  • F-DPCH fractional downlink dedicated physical channel
  • the modulation and multiple access scheme employed by the access network 700 may vary depending on the particular telecommunications standard being deployed.
  • the standard may include Evolution-Data Optimized (EV-DO) or Ultra Mobile Broadband (UMB).
  • EV-DO and UMB are air interface standards promulgated by the 3rd Generation Partnership Project 2 (3GPP2) as part of the CDMA2000 family of standards and employs CDMA to provide broadband Internet access to mobile stations.
  • 3GPP2 3rd Generation Partnership Project 2
  • the standard may alternately be Universal Terrestrial Radio Access (UTRA) employing Wideband-CDMA (W-CDMA) and other variants of CDMA, such as TD-SCDMA; Global System for Mobile Communications (GSM) employing TDMA; and Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Flash-OFDM employing OFDMA.
  • UTRA, E-UTRA, UMTS, LTE, LTE Advanced, and GSM are described in documents from the 3 GPP organization.
  • CDMA2000 and UMB are described in documents from the 3GPP2 organization.
  • the actual wireless communication standard and the multiple access technology employed will depend on the specific application and the overall design constraints imposed on the system.
  • the radio protocol architecture may take on various forms depending on the particular application. An example for an HSPA system will now be presented with reference to FIG. 8.
  • an example radio protocol architecture 800 relates to the user plane 802 and the control plane 804 of a user equipment (UE) or node B/base station.
  • architecture 800 may be included in a UE such as UE 12 (FIG. 1) having a modem component 20.
  • the radio protocol architecture 800 for the UE and node B is shown with three layers: Layer 1 806, Layer 2 808, and Layer 3 810.
  • Layer 1 806 is the lowest layer and implements various physical layer signal processing functions. As such, Layer 1 806 includes the physical layer 807. Layer 2 (L2 layer)
  • Layer 3 (L3 layer) 810 includes a radio resource control (RRC) sublayer 815.
  • RRC sublayer 815 handles the control plane signaling of Layer 3 between the UE and the UTRAN.
  • the modem component 20 may operate at Layer 1 to control the transmission power, but may also provide layer
  • the L2 layer 808 includes a media access control (MAC) sublayer 809, a radio link control (RLC) sublayer 811, and a packet data convergence protocol (PDCP) 813 sublayer, which are terminated at the node B on the network side.
  • MAC media access control
  • RLC radio link control
  • PDCP packet data convergence protocol
  • the UE may have several upper layers above the L2 layer 808 including a network layer (e.g., IP layer) that is terminated at a PDN gateway on the network side, and an application layer that is terminated at the other end of the connection (e.g., far end UE, server, etc.).
  • IP layer e.g., IP layer
  • the PDCP sublayer 813 provides multiplexing between different radio bearers and logical channels.
  • the PDCP sublayer 813 also provides header compression for upper layer data packets to reduce radio transmission overhead, security by ciphering the data packets, and handover support for UEs between node Bs.
  • the RLC sublayer 811 provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data packets to compensate for out-of-order reception due to hybrid automatic repeat request (HARQ).
  • HARQ hybrid automatic repeat request
  • the MAC sublayer 809 provides multiplexing between logical and transport channels.
  • the MAC sublayer 809 is also responsible for allocating the various radio resources (e.g., resource blocks) in one cell among the UEs.
  • the MAC sublayer 809 is also responsible for HARQ operations.
  • FIG. 9 is a block diagram of a Node B 910 in communication with a UE 950, where the Node B 910 may be the network entity 14 in FIG. 1 or Node B 208 in FIG. 6, and the UE 950 may be the UE 12 in FIG. 1 or the UE 210 in FIG. 6.
  • a transmit processor 920 may receive data from a data source 912 and control signals from a controller/processor 940. The transmit processor 920 provides various signal processing functions for the data and control signals, as well as reference signals (e.g., pilot signals).
  • the transmit processor 920 may provide cyclic redundancy check (CRC) codes for error detection, coding and interleaving to facilitate forward error correction (FEC), mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M- quadrature amplitude modulation (M-QAM), and the like), spreading with orthogonal variable spreading factors (OVSF), and multiplying with scrambling codes to produce a series of symbols.
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M- quadrature amplitude modulation
  • OVSF orthogonal variable spreading factors
  • channel estimates may be derived from a reference signal transmitted by the UE 950 or from feedback from the UE 950.
  • the symbols generated by the transmit processor 920 are provided to a transmit frame processor 930 to create a frame structure.
  • the transmit frame processor 930 creates this frame structure by multiplexing the symbols with information from the controller/processor 940, resulting in a series of frames.
  • the frames are then provided to a transmitter 932, which provides various signal conditioning functions including amplifying, filtering, and modulating the frames onto a carrier for downlink transmission over the wireless medium through antenna 934.
  • the antenna 934 may include one or more antennas, for example, including beam steering bidirectional adaptive antenna arrays or other similar beam technologies.
  • a receiver 954 receives the downlink transmission through an antenna 952 and processes the transmission to recover the information modulated onto the carrier.
  • the information recovered by the receiver 954 is provided to a receive frame processor 960, which parses each frame, and provides information from the frames to a channel processor 994 and the data, control, and reference signals to a receive processor 970.
  • the receive processor 970 then performs the inverse of the processing performed by the transmit processor 920 in the Node B 910. More specifically, the receive processor 970 descrambles and despreads the symbols, and then determines the most likely signal constellation points transmitted by the Node B 910 based on the modulation scheme. These soft decisions may be based on channel estimates computed by the channel processor 994.
  • the soft decisions are then decoded and deinterleaved to recover the data, control, and reference signals.
  • the CRC codes are then checked to determine whether the frames were successfully decoded.
  • the data carried by the successfully decoded frames will then be provided to a data sink 972, which represents applications running in the UE 950 and/or various user interfaces (e.g., display).
  • Control signals carried by successfully decoded frames will be provided to a controller/processor 990.
  • the controller/processor 990 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.
  • the channel processor 994 may also determine channel conditions for the downlink channel and generate the CQI.
  • the ACK/NACK and CQI may be transmitted to the base station 910 on the HS- DPCCH.
  • the modem component 20 may operate as described above and may, for example, scale the transmission power of the HS-DPCCH when the UE 950 is power limited and/or there is no downlink traffic to the UE 950.
  • the modem component 20 may be integrated with or implemented by the controller/processor 990, transmit frame processor 982, and/or transmitter 956.
  • a transmit processor 980 In the uplink, data from a data source 978 and control signals from the controller/processor 990 are provided to a transmit processor 980.
  • the data source 978 may represent applications running in the UE 950 and various user interfaces (e.g., keyboard). Similar to the functionality described in connection with the downlink transmission by the Node B 910, the transmit processor 980 provides various signal processing functions including CRC codes, coding and interleaving to facilitate FEC, mapping to signal constellations, spreading with OVSFs, and scrambling to produce a series of symbols.
  • Channel estimates may be used to select the appropriate coding, modulation, spreading, and/or scrambling schemes.
  • the symbols produced by the transmit processor 980 will be provided to a transmit frame processor 982 to create a frame structure.
  • the transmit frame processor 982 creates this frame structure by multiplexing the symbols with information from the controller/processor 990, resulting in a series of frames.
  • the frames are then provided to a transmitter 956, which provides various signal conditioning functions including amplification, filtering, and modulating the frames onto a carrier for uplink transmission over the wireless medium through the antenna 952.
  • the uplink transmission is processed at the Node B 910 in a manner similar to that described in connection with the receiver function at the UE 950.
  • a receiver 935 receives the uplink transmission through the antenna 934 and processes the transmission to recover the information modulated onto the carrier.
  • the information recovered by the receiver 935 is provided to a receive frame processor 936, which parses each frame, and provides information from the frames to the channel processor 944 and the data, control, and reference signals to a receive processor 938.
  • the receive processor 938 performs the inverse of the processing performed by the transmit processor 980 in the UE 950.
  • the data and control signals carried by the successfully decoded frames may then be provided to a data sink 939 and the controller/processor, respectively. If some of the frames were unsuccessfully decoded by the receive processor, the controller/processor 940 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • the controller/processors 940 and 990 may be used to direct the operation at the Node B 910 and the UE 950, respectively.
  • the controller/processors 940 and 990 may provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the computer readable media of memories 942 and 992 may store data and software for the Node B 910 and the UE 950, respectively.
  • a scheduler/processor 946 at the Node B 910 may be used to allocate resources to the UEs and schedule downlink and/or uplink transmissions for the UEs.
  • TD-SCDMA High Speed Downlink Packet Access
  • HSDPA High Speed Downlink Packet Access
  • HSUPA High Speed Uplink Packet Access
  • HSPA+ High Speed Packet Access Plus
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • CDMA2000 Evolution-Data Optimized
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Ultra-Wideband
  • Bluetooth Bluetooth
  • the actual telecommunication standard, network architecture, and/or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.
  • processors include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • DSPs digital signal processors
  • FPGAs field programmable gate arrays
  • PLDs programmable logic devices
  • state machines gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • One or more processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the software may reside on a computer-readable medium.
  • the computer-readable medium may be a non-transitory computer-readable medium.
  • a non-transitory computer-readable medium includes, by way of example, a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip), an optical disk (e.g., compact disk (CD), digital versatile disk (DVD)), a smart card, a flash memory device (e.g., card, stick, key drive), random access memory (RAM), read only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), a register, a removable disk, and any other suitable medium for storing software and/or instructions that may be accessed and read by a computer.
  • a magnetic storage device e.g., hard disk, floppy disk, magnetic strip
  • an optical disk e.g., compact disk (CD), digital versatile disk (DVD)
  • a smart card e.g., a flash memory device (e.g., card, stick, key drive), random access memory (RAM), read only memory (ROM), programmable ROM
  • the computer-readable medium may also include, by way of example, a carrier wave, a transmission line, and any other suitable medium for transmitting software and/or instructions that may be accessed and read by a computer.
  • the computer-readable medium may be resident in the processing system, external to the processing system, or distributed across multiple entities including the processing system.
  • the computer-readable medium may be embodied in a computer-program product.
  • a computer- program product may include a computer-readable medium in packaging materials.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne la réduction de surdébit de canal de commande de liaison montante au niveau d'un équipement utilisateur (UE). L'UE peut déterminer qu'une puissance d'émission totale de l'UE dépasse une puissance allouée. L'UE peut ensuite changer l'échelle d'une puissance d'émission d'un canal de commande physique dédié à haut débit (HS-DPCCH) par rapport à un canal de commande physique dédié (DPCCH) en réponse à la détermination que l'UE est limité en puissance. L'UE peut mettre à l'échelle la puissance d'émission du HS-DPCCH lorsqu'il n'y a pas d'activité de liaison descendante comme déterminé, par exemple, par l'expiration d'un minuteur. Dans un aspect, l'UE peut transmettre une indication que l'UE est limité en puissance, par exemple, au moyen d'un bit de poids fort d'un indice de combinaison de format de transport. Dans un autre aspect, l'UE peut recevoir une indication qu'une transmission de liaison descendante est imminente, et, en réponse, l'UE peut transmettre le HS-DPCCH sans changer l'échelle de sa puissance d'émission.
EP15717286.7A 2014-03-21 2015-03-13 Réduction de surdébit hs-dpcch dans des scénarios multi-rab Active EP3120622B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201461969014P 2014-03-21 2014-03-21
US14/516,276 US9603106B2 (en) 2014-03-21 2014-10-16 HS-DPCCH overhead reduction in multi-RAB scenarios
PCT/US2015/020486 WO2015142653A1 (fr) 2014-03-21 2015-03-13 Réduction de surdébit hs-dpcch dans des scénarios multi-rab

Publications (2)

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EP3120622A1 true EP3120622A1 (fr) 2017-01-25
EP3120622B1 EP3120622B1 (fr) 2019-04-24

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US (1) US9603106B2 (fr)
EP (1) EP3120622B1 (fr)
JP (1) JP6553077B2 (fr)
KR (1) KR102306683B1 (fr)
CN (1) CN106105337B (fr)
BR (1) BR112016024119B1 (fr)
WO (1) WO2015142653A1 (fr)

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CN105993198B (zh) * 2015-01-16 2019-07-12 华为技术有限公司 用户设备发射功率的控制方法及装置
US10341952B2 (en) 2016-03-14 2019-07-02 Apple Inc. Low power LTE (LP-LTE) paging monitoring
US10412669B2 (en) * 2016-03-14 2019-09-10 Apple Inc. Low power cellular modem system architecture
US10085275B2 (en) 2016-03-14 2018-09-25 Apple Inc. Synchronization and interprocessor communication in a low power LTE system architecture

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US8160029B2 (en) * 2006-12-19 2012-04-17 Alcatel Lucent Methods for power reduction detection for enhanced dedicated channel
US8699447B2 (en) * 2009-02-27 2014-04-15 Nokia Siemens Networks Oy Methods, apparatuses, and computer program products for prioritizing uplink carriers
CN101848484A (zh) * 2010-04-29 2010-09-29 华为技术有限公司 检测用户设备ue功率受限的方法、设备及系统
EP2398176B1 (fr) * 2010-06-18 2013-05-15 Alcatel Lucent Configuration de réseau à multi-porteuses
US9497773B2 (en) * 2012-02-08 2016-11-15 QUALOCOMM Incorporated Method and apparatus for enhancing resource allocation for uplink MIMO communication
CN102843759B (zh) * 2011-06-23 2016-03-02 华为技术有限公司 一种上行多入多出信道的功率控制方法和用户设备
US8917636B2 (en) * 2011-06-30 2014-12-23 Intel Mobile Communications GmbH Transmitter circuit and method
US9591593B2 (en) 2011-07-22 2017-03-07 Qualcomm Incorporated Systems, methods and apparatus for radio uplink power control
US8873535B2 (en) * 2011-09-26 2014-10-28 Qualcomm Incorporated Systems, methods and apparatus for retransmitting protocol data units in wireless communications
US9055533B2 (en) * 2011-12-16 2015-06-09 Intel Corporation Wireless communication device and method for improved WiFi and bluetooth coexistence usingreduced power for control packets
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Publication number Publication date
US20150271769A1 (en) 2015-09-24
CN106105337B (zh) 2020-01-21
BR112016024119B1 (pt) 2024-02-27
BR112016024119A2 (pt) 2018-11-06
KR20160135203A (ko) 2016-11-25
JP2017513308A (ja) 2017-05-25
JP6553077B2 (ja) 2019-07-31
KR102306683B1 (ko) 2021-09-28
CN106105337A (zh) 2016-11-09
US9603106B2 (en) 2017-03-21
WO2015142653A1 (fr) 2015-09-24
EP3120622B1 (fr) 2019-04-24

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